Audio amplifying transformer and static eliminator



y 1935- A. STRAKA 2,000,424

AUDIO AMPLIFYING TRANSFORMER AND STATIC ELIMINATOR Filed Nov. 11.1931

', Patented May 7, 1935 UNITED'STATES PATENT OFF-ice;

AUDIO AMPLIFYING TRAN SFORMER AND :STATIC ELIMINATOR Anton'Straka, Chicago,Ill. Application November "11, 1931, Serial No. 574,399 T'" jCla'imsJf. (Cl.'250-20) f v f This invention relates to radio transmission ble operating means for the'dev-ice. The strips and has special reference to an audioamplifying or slides l3 and I4 carry a third insulating head transformer and static eliminator.-

l8 which may thus be moved toward and from One important object of the invention is to the head ll. Y '5 improve the general construction of devices-of Supported in the-heads Hi and- H in acircular 5 this character. I I r series about the centers of these heads are spaced A second important object of theinvention is metallic tubes is preferably open at both-ends. to provide a novel device of this class wherein a These tubes are connected in continuous seri'es thin air gap is employed in the primary circuit to by a wire or otherconductor 20- Which-'in- 'turn =10 produce an ionized field which inductivelyaifects is connected to a suitable building post M by a 10 the secondary circuit to produce a current therein. Wire 22. The tubes- I 9 are thus connectedin A third important object of the invention'is to multiple to the post which forms the connection .provide 'a-novel device of this character wherein for one terminal 23 of the input or primary'cirthe area of the air gap in the primary circuit cuit. Tubes 24 are carriedby the head I8 and is may be varied at will. are arranged in axial alinement' with the 'respec- A fourth important object of the invention is tive tubes l9, the tubes 24 having an external to provide a novel transformer ofthis class diameter slightly less than the intemal-diameter wherein the air gap in the primary circuit is of the tubes l9 and projecting into said-tubes l9 formed by the nesting, one within theother, of a to leave thin air p 5. The tubes-24' are conpair of concentric tubes, one or'more pairs of nected,"like the tubes l9, in continuous Ser es by 20 such tubes being capable of use in this connection. a wire 26. which is in turn connected by a wire 21 With the above and other objects in view the with a binding post '28 carriedby the head-- I8. invention consists in general: of certain novel de- The binding post 28 forms theconnec tio'n for'the tails of construction and combination of parts remaining terminal f iheinput D hereinafter fully described, illustrated in the circuit,

accompanying drawing, and specifically claimed. As thus constructed the tubes-Ill form a frame In the accompanying drawing like characters 'on which is wound the secondary winding '30 of reference indicate like parts in the several formed of fine insulated wire and having one views, and: end of the winding connected to a binding post 30 Figure 1 is an end elevation of the invention. 3| and its other end connected to a binding 30 Figure 2 is a side elevation thereof. post 32, the e di posts being e S own as Figure 3 is a section on the line. 3-3 of Figure 2. mounted on the head In and form connec- Figure 4 is a section on the line 4-4 of Figure 1 tions for the respective terminals 33 and 34 0f the with the parts behind the plane of section Output or secondary circuit.

35 omitted. Obviously, since it has been above set forth 35 Figure 5 is a schematic diagram of the circuit that t e te n s 23 d 29 are the input arrangements herein used. minals and the terminals 33 and 34 arethe output In the embodiment of the invention as herein terminals, the device, when used in a radio illustrated there is provided a pair of spaced iving set will h ve h npu rminals con heads l0 and H which are formed preferably of neeted, s in a other transformers thus used. 40 insulating material. These heads are substanto one tube and the output terminals connected tially square and at opposite edges carry guide to the next succeeding tub In Such ease, as strips I2. The strips 12 are arranged in spaced Well understood by those skilled in the art, the pairs and have their adjacent edges undercut as P es t v ce is be be connected in Parallel to clearly shown in Figures 1 and 3. Sliding bea resistance 35 that is included in the plate cir- 45 tween the upper pair of the strips I 2 is a guide cuit. The output terminals are connected restrip 13 having its edges bevelled to fit the spectively to the filament and. grid of the second bevelled edges of the strips l2. A similar guide tube. Under such conditions it is found,inactual strip [4 is carried between the lower strips I2 practice, that the static efiects are greatly reand on the under side of this strip I4 is a gear duced and it is believed that this is due to the 50 rack l5 wherewith meshes a pinion l6 mounted ionized field between the inner and outer tubes; on a shaft I! provided with an operating knob or Under these conditions the pri y current handle l8. This operating means is suitably d s an o ed fiel u to the p 25 a d mounted in the casing used for apparatus of this this causes the production of a secondary current character, being here shown to indicate a suitain the secondary winding 30, the primary ourrent being of relatively low and the secondary current being of relatively high voltage. Moreover, by moving the tubes 24 in or out of the tubes I9 telescopically, the areas of the air gaps between the tubes 24 and I9 can be increased or diminished at will and thereby the amplification can be regulated as desired.

There has thus been provided a simple and efiicient deviceof ,the kind described, and for the purposespecified. f Z 5 1 i It is" obvious that changes may be made in the form, construction, and proportions of the invention. It is not, therefore, desired to confine the invention to the exact .form herein .shown and described but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is terminal, and -a;-secondary. winding of fine wire surrounding the outer'tubes.-

-2. In a devicesof the jkind described,sa pair of spaced plates, a-series, of parallel tubes supported ,in ,said plates aathird similar plate I movable towardiand from one of the pair ofv plates, a ;series;o f tubes :carried;by the third plate. and .each projecting telescopically in a respective first tube, the tubes ,ofgthe second-series being concentrically spaced :within the, tubesofthe first series, means-,to connect all -.-of, the outer tubes in multiple to a circuit terminaLothenmeans to .connect all of the inner tubes in-multiple to a second circuit terminal,anda secondarywinding of fine ,wire surrounding :the outer tubes.

, '3,,,In' a device of,the kind described,',a pair of spaced plates a series of parallel tubes supported in said plates, a third similar plate movable toward and from one of the pairof plates, a series -;0f tubes carried by the third plate and each projecting telescopically in a respective first tube, the tubes of the second series being concentrically spaced within the tubes of the first series, slidable guide means connecting the third plate with the pair of plates, means to connect all of the outer tubes in a multiple to a circuit terminal, other means to connect all of the inner tubes in multiple to a second circuit terminal, and a secondary winding of fine .wire. surrounding the outertub'esn.

4. In a device of the klndde'scribed, a pair of spaced plates, a series of parallel tubes supported in said plates, a third similar plate movable toward and from one of the pair of plates, a series of tubes carried by the third plate and each projecting telescopically in a respective first tube, the'tubes of the second series being concentrically spaced withinithe tubes of the first series, pairs of spaced guide strips connecting the pair of plates, other guide strips carried by the third plate and slidably, fitting between the respective pairs of guidestrips, means to connect all of the outer tubes inmultiple to a circuit terminal,

other means .to connect all of the, inner tubes in multiple to a second circuit terminal, and a secondary winding of fine Wire surrounding the .outer.tubes.,-

5. In a device of the kind described; a pair of spaced plates,'aseries of parallel tubes supported :in, said p,lates,-'a third similar plate movable towardand from orient the pair ,ofy-plates, a series vof tubes carried by 'the'third' plate and each projecting telescopically in a respective first tube, the tubes of the second seriesbeing concentrically spaced within the tubes of the ,first'series, pairs of, spacedguide.strips,.c0nnecting the pair of plates, other guide strips carried byithe third plate and slidably fittingbetween the respective pairs of guide strips, a rack on, one of the last mentionedguide strips,-a pinion meshing with said rack to move the rack;inwardly and outwardly, means to connect all of the outer tubes in multiple to a circuit terminaL-othermeans to connect all ofthe inner-tubes in multiple to a second circuit-terminal, and a secondary winding of fine wire surrounding the outer tubes.

s J ANTON STRAKA. 

